Structure and Composition of the Atmosphere Answers

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1
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Which phrase describes air density?

A
increases as altitude increases
B
equals mass divided by volume
C
pushes molecules in one direction
D
exerts less pressure as it increases
2
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Which is one way that Earth’s atmosphere supports life?

A
It filters out oxygen.
B
It keeps Earth warm.
C
It increases UV radiation.
D
It provides a solid shield.
3

Which correctly lists three characteristics that are used to describe air?

A
altitude, density, radiation
B
density, radiation, mass
C
mass, pressure, density
D
pressure, altitude, radiation
4

Which phrase describes density?

A
height of a point above sea level
B
force pushing on an area or a surface
C
amount of mass in a certain volume
D
amount of matter an object contains
5

Which gas is most abundant in Earth’s atmosphere?

A
oxygen
B
nitrogen
C
water vapor
D
carbon dioxide
7

As altitude increases, what happens to air pressure?

A
It fluctuates.
B
It increases.
C
It decreases.
D
It stays the same.
12

Which gas is most abundant in Earth’s atmosphere?

A
oxygen
B
nitrogen
C
water vapor
D
carbon dioxide
13

Which is one way that Earth’s atmosphere supports life?

A
It filters out oxygen.
B
It keeps Earth warm.
C
It increases UV radiation.
D
It provides a solid shield.
14

Which correctly lists three characteristics that are used to describe air?

A
altitude, density, radiation
B
density, radiation, mass
C
mass, pressure, density
D
pressure, altitude, radiation
15

Which gas in Earth’s atmosphere forms ozone?

A
oxygen
B
nitrogen
C
water vapor
D
carbon dioxide
16

Which characteristic describes the troposphere?

A
contains the ozone layer
B
has the highest air pressure
C
spans 12–50 km above Earth
D
is a good place for planes to fly
17

Which describes one of oxygen's roles in Earth’s atmosphere?

A
allows fuels to burn
B
forms clouds that produce rain
C
is the gas that animals exhale
D
is used by plants to produce food
18

Which gas in Earth’s atmosphere has increased over time due to burning fossil fuels?

A
oxygen
B
nitrogen
C
water vapor
D
carbon dioxide
19

Which atmospheric layer prevents meteoroids from reaching Earth’s surface?

A
mesosphere
B
stratosphere
C
thermosphere
D
troposphere
20

Which phrase describes air density?

A
increases as altitude increases
B
equals mass divided by volume
C
pushes molecules in one direction
D
exerts less pressure as it increases

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